21862601 has 2 divisors, whose sum is σ = 21862602. Its totient is φ = 21862600.

The previous prime is 21862591. The next prime is 21862609. The reversal of 21862601 is 10626812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11397376 + 10465225 = 3376^2 + 3235^2 .

It is a cyclic number.

It is not a de Polignac number, because 21862601 - 2⁶ = 21862537 is a prime.

It is equal to p_1381085 and since 21862601 and 1381085 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21862609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10931300 + 10931301.

It is an arithmetic number, because the mean of its divisors is an integer number (10931301).

Almost surely, 2^21862601 is an apocalyptic number.

It is an amenable number.

21862601 is a deficient number, since it is larger than the sum of its proper divisors (1).

21862601 is an equidigital number, since it uses as much as digits as its factorization.

21862601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21862601 is about 4675.7460367304. The cubic root of 21862601 is about 279.6193850606.

The spelling of 21862601 in words is "twenty-one million, eight hundred sixty-two thousand, six hundred one".